This has probably been posted to death, but Glock does offer LE discount (about $100 per weapon) to Active and Retired Military. They also give the same discount to Fire/EMS. You have to buy from a stock LE Dealer. Call Glock, 770-432-1202 and they'll tell you who the stocking LE Dealers are in your state. Additionally, you'll get three mags w/ your pistol rather than the customary 2.
OK, also found a link, http://www.gssfonline.com/GSSF_PISTOL_PURCH_LIST.pdf which will give you your state's LE Dealers.
Makes me ill that I just bought a 19C for retail, but I was, and am, happy with the purchase.